updated 12:00 pm EDT, Thu August 16, 2012

Up to five DRM-free games available for charitable donation

The third Humble Bundle to feature Android games (as well as versions for Mac, Windows and Linux) has been launched, featuring up to five games in a bundle deal where users decide not only the amount they want to pay, but also what percentage of the price goes to the developers, the Humble Bundle team, or two charities -- digital rights group the Electronic Frontier Foundation, and the Child's Play organization, which donates gaming equipment and games to children's hospitals.

All of the games are available for Android, though two of them are tablet-only and one game is making its debut on the platform. The four regular games of the bundle Fieldrunners, Bit.Trip Beat, Uplink and SpaceChem. Fieldrunners is a classic variation on the tower-defense scenario, Bit.Trip Beat is a retro-8bit Pong turned into a music rhythm game, Uplink is a Wargames-styled cyberpunk treasure hunt with the player as a hacker-for-hire infiltrating systems to acquire secrets, and SpaceChem casts users in the role of a Reactor Engineer who must create formulas of atoms in order to build needed chemicals.

A fifth game -- Spirits, a puzzle platfomer where strategy and sacrifice play equal roles -- is available if users donate more for the bundle than the average price, which currently sits at $6.07. As has been traditional with the Humble Bundle offers, Linux users have donated the most per capita ($8.83), followed by Mac users ($6.60), with Windows users once again under the average with a per-capita contribution of $5.42. The site's real-time contribution meter hasn't yet been updated to show average Android per-capita contributions.

System requirements for each game vary by system, and MP3 versions of the soundtracks for most games are also included at no additional cost. The promotion has thus far sold 54,000 bundles in its first 17 hours, raised over $328,000 and will run for another 13 days.